Filtration device



FIG. 1 is a top, front, right perspective view of a filtration device showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a partial perspective cross-sectional view of the filtration device taken along the line 8-8 showing in FIG. 7.

The broken lines in the drawings illustrate portions of the filtration device which form no part of the claimed design. 

CLAIM I claim the ornamental design for a filtration device, as shown and described. 